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I just don’t see the evidence for hoplites using longer spears for Hoplites in the 4th or 3rd centuries BC (aside from the alleged Iphikratean reforms). Why would a 12 ft spear be any better then an 8 or 9ft spear as a response to the Macedonian pikes? Also an underarm thrust style with such a long spear seems likely to be as hazardous to you own rear ranks as the enemy. The response to the Macedonian system was rather to improve hoplite training, and/or adopt the Macedonian system, keeping only a core of ‘select’ hoplites (presumably to fill the same role as hypaspists).
Read Diadoros and Nepos.